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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 755 (FAN CONTROLS)SYMPTOM TROUBLESHOOTING INDEX
2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Symptom Troubleshooting Index

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Symptom Troubleshooting Index
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
TROUBLESHOOTING CHART

Symptom Diagnostic Procedure Also check for
Engine overheats
  1. Inspect the water pump (see WATER PUMP INSPECTION ).
  2. Check the thermostat (see FAN MOTOR TEST ).
  3. Check for any engine coolant leakage (from gaskets, hoses, O-rings, etc.).
  4. Check for dirt, leaves, or insects on radiator and A/C condenser.
  5. Check for a damaged or deformed fan shroud.
  6. Check for plugged or deteriorated radiator hoses.
  7. Check the radiator cap (see RADIATOR CAP TEST ).
  8. Inspect the fan motors (see FAN MOTOR TEST ) or fan relays (see POWER RELAY TEST ).
  9. Check for plugged heater core or hoses.
  10. Check the coolant level.
  11. Check for deteriorated coolant.
  12. Check for a damaged cylinder head gasket.
  
The radiator fan runs at low speed, but does not run at high speed when the engine coolant temperature is above 206 °F (97 °C) Radiator fan high speed circuit troubleshooting (see RADIATOR FAN HIGH SPEED CIRCUIT TROUBLESHOOTING  ). Cleanliness and tightness of all connectors
With the A/C off and the engine coolant temperature at 206 °F (97 °C) or below, the A/C condenser fan runs at high speed and the radiator fan does not run. When the engine coolant temperature is above 206 °F (97 °C), both fans run at high speed Remove the fan control relay, and test.
  • If the relay is faulty, replace it.
  • If the relay is OK, check for a short in the wire between fan control relay 5P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 1.
 Cleanliness and tightness of all connectors
The radiator fan and the A/C condenser fan run at high speed with the ignition switch ON (II), the A/C off, and the engine coolant temperature below 204 °F (95 °C) Check for a short in the wire between radiator fan relay 4P socket terminal No. 3 and PCM connector terminal A5. Cleanliness and tightness of all connectors
Both the radiator fan and the A/C condenser fan run at low speed with the ignition switch ON (II) and the A/C off Check for a short in the wire between radiator fan relay 4P socket terminal No. 3 and PCM connector terminal A4. Cleanliness and tightness of all connectors
Both the radiator fan and the A/C condenser fan do not run at low speed with the A/C on Radiator and A/C condenser fans low speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT TROUBLESHOOTING ). Cleanliness and tightness of all connectors
The A/C condenser fan does not run at all. The radiator fan does not run at low speed, but it runs at high speed A/C condenser fans high speed circuit troubleshooting (see A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING ). Cleanliness and tightness of all connectors
Both the radiator fan and the A/C condenser fan do not run at high speed when the engine coolant temperature is above 206 °F (97 °C) Check for an open in the wire between fan control relay 4P socket terminal No. 3 and PCM connector terminal A5. Cleanliness and tightness of all connectors
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.